Jacek Marmuszewski Email & Phone Number

Wieliczka, Pl

Let's Go DevOps is a technology consulting company that’s deeply rooted in the DevOps world. We empower businesses to maximize their potential by optimizing cloud infrastructure, enhancing security, reducing costs, and driving efficiency.We’ve built a reputation for delivering advanced DevOps solutions to leading global clients like Worldcoin or AirHelp. Our team of experts works hand-in-hand with these organizations to tackle complex challenges and ensure their success.Operating in the fast-evolving crypto industry, we bring specialized expertise to help crypto companies scale, secure their infrastructure, and streamline operations.At Let's Go DevOps, we don’t just solve problems - we shape the future of DevOps.

My work focuses on building scalable and secure AirHelp platform. Together with my team we are following Infrastructure as Code paradigm witch propper PR and Code Review process. For better cross-team collaboration we work closely with product teams to share infrastructure best practices and better understand AirHelp products. * Applications migration from Heroku, through Chef managed EC2s to Kubernetes (GKE and EKS)* Introduction of Docker (maintaining company images, trainings, application support) * Multi-cloud architecture (AWS and GCP)* Server provisioning automation with Chef* Application templates managed witch Chelm Charts* Full Infrastructure as Code with Terraform * Build of "Environment per pull request" - dynamic environments based on docker containers and docker swarm* Creating terraform modules reflecting company policies and processes* Writing and maintaining infrastructure scripts in Bash, Ruby, Python and Golang* Managing build and deployments scripts for our CI/CD pipelines* Introduced service autodiscovery based on Hashicorp Consul* Load balancing done with CloudFlare, AWS ELB and Nginx* Managing ELK stack which over 40k index rq/s * Troubleshooting PostgreSQL performance problems * Support for Ruby, Python, Golang and NodeJS production applications* Experience in development, and maintenance of Serverless (AWS Lambda) applications * Organising Chaos Monkey events testing infrastructure and application resilience * Creation of AirHelp Internal Security Audit playbook* Following leads from Security Audits with occasional Penetration Testing of AirHelp applications* Prepared and hosted company wide trainings (Postgres, AWS, Security, chef, terraform)* Promote company in multiple meetups and conferences (KRUG, TRUG, SysOps/Devops, Devops * Space, Noc Informatyka)

Kraków Area, Poland

My main objectives were: * supporting of dev teams with CI processes (Hudson)* preparation of testing environments (Oracle Linux, Ansible)* migration of cvs and svn repositories to Git and trainings for the organisation* tooling for integrating teams JavaScrip SPA app with rest of Fusion Apps suite

Kraków Area, Poland

Kraków Area, Poland

Continuation of my previous assignment, with more focus on improving system stability duringoffload process. I was assigned as engineer supporting legacy system - where my biggestsuccess was nearly 2 years of uninterrupted system availability (during which system got offloadedand sunset).As part of my assignment I was also helping offload initiative which data analysts and capacity planing.

Most of my work was related to product maintenance (which included both system engineeringand development skills). Application was build on top of complex relational database model,serving up to 160 transactions per second. Additional challenges came from unique hardwareand software solutions chosen by company (HP NonStop - also know as Tandem/Compaq NonStopKernel) which had its impact on every programing language used there (this includes unique Java"features")

During my internship I worked as developer in team building application that became "domaincontroller" for one of Sabres high-transaction systems.